Telephone-transmitter.



.SKINDERVIKENI TELEPHONE TRANSMITTER. APPLICATION mw Nov. 7. 1911.

' Patented Aug. 33; H918,

backing 11. A plate 12 `eXtends acrssthe,

thereafter be maintained no matter into what position the transmitter may `be turned.

As a matter of convenience in construction, I have providedia rod.8 of electrically y conducting material which extends throughi a hole in the outer shelll 5, Jand has its inner end rigidly connected to the ball 4; 'A sleeve 'of-,ins ulati'ng\ material 9 incases-the lowen "10.

connection to saidA shell solas `to establish the desired relative positioningef the' ball 4 with respect ltothe shell 5.

' As fa furtherimatter of convenience in mechanical construction, I. have shownv the invention as applied to a transmitter having antouth piece 10 and a bodyf'portion or body or. back 11 and carries the mouth piece` 10. T he shell 5 is located directly opposite other terminal 'to themou'th piece so ithat thevibrations will* be directly transmitted to the shell 5. The rod 8 has its outer end attached to a ring y13 which is. incasedbya rubber gasket or the like 14;v which'servesv to electrically insulate the ring from the caseor back of the' transmitter. The ring 13 "and rod 8 constitute one pole of the transmitter, Whereas thel shell 5 constitutes the-other pole and the wire. should -be attachedY thereto. i

Inthe arrangement shown in/Fig. 3, the transmitter is directly connected to the diaphragm 15. This is` done by connecting the rod 8 rigidly to thecentral portion of the diaphragm as by means 'ofthe nut 16. The rubberl washer 'o r the like 17 surrounds the peripheryoffthe diaphragm and may takefqthea place of the washer ,14 of'the ar- Itangementshown in Figs. `1 "and 2. MlIn the la1frangementrshovvliz,"in' Fig.-3, 'the vibrations of the diaphragmwwill `be directly vtransmitted to the ball or `spherefand through the medium of ,the rod 8.

The@4 arrangement shown; .in 3 presents, in somecs'ises, the 'advatagethat the, transmitting device 'therein .illustrated can bedirectly attached or connected to the diaphragrmV of anefXisting transmitter without anyinodiication or 'change whatsoever in the ,maing body portion of they transmitter. The only change .necessary is to removethe disk transmitterfrom the diaphragm 15 and substitute the spherical transmitter herein illustrated.

' 'In `the arrangementshownV in Fig.- 4 the transmitting device comprises an inner conical plug 18 in `combination with an outer conical shell or cup 19 providing a conical space between them within which is containedthe carbongranules 20. The conical shell or `cup"19 has its periphery 21 threaded for the accommodationv of `a mical or other insulating disk 22 'to the central portion of which is attached the conical plug 1S. yThis Vattachment may be' way of a threaded pin 23 which extends through thediaphra gm 24.' tThe inner conical plug constitutes one l.terminal of the device, and the outer conical y,end "ofthe rod 8- and insulates said rod from the Ishell `5 as well .as providing a mechanical' shell constitutes the other terminal.v

It will be understood that, while asa matter of c onvenienceIy haveillustrated the principles of my invention as being containedfwithin a ytransmitter in which the ypoles are of circular form, still the* essential feature is that said-poles shall bevof concave and convexsurface respectively,iso that from the diaphragm to both of said electrodes, the electrodes being formed on curved surfaces, and the convex portion of one of said surfaces lying opposite to the concave portion of the other surface for the purpose specified. i

2. A telephone transmitter comprising a diaphragm and a pair of electrodes in conjunction therewith, a'rigid connection from` the diaphragm to the electrodes, and granular conducting material between the electrodes, the electrodes having curved surfaces, and the convexsurface of one electrode lying opposite to the concave portion of the other electrode for the purpose specified.

'3. A' telephone tralismitter comprising` in "combination, a diaphragm, a pair of elecytrodesl rigidly connected thereto, and granular conducting material between the electrodes, the electrodes having complementary curved surfaces, the protruding portion of one surface lying opposite to the receding portion of the other surface, for the purpose specified.

4. A telephone transmitter comprising, in combination, a diaphragm, a pair of electrodes rigidly connected thereto, and granular conducting'l material'between the electrodes, the electrodes being formed ou complementary curved surfaces, forthe purpose specified.

' JOHAN SKINDERVIKEN. 

